Delete row sig_a9718057448c from signals

id sig_a9718057448c
event_id evt_e700555ccfde
watcher_id NULL
signal_type news_headline_delta
value {"aggregator_url":"https://news.google ...
threshold NULL
direction NULL
severity NULL
window NULL
source news_rss
reason_trace {"_evidence_event_ids":["evt_1052732c0 ...
dedupe_key signal_enriched:news_delta:41992684732f98f0
throttle_s 0
created_at 2026-04-20T17:59:51.990503+00:00
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